Add renice

Co-authored-by: Sylvestre Ledru <sylvestre@debian.org>

Cargo.lock

@@ -978,6 +978,7 @@ dependencies = [
  "uu_lsmem",
  "uu_mesg",
  "uu_mountpoint",
+ "uu_renice",
  "uu_rev",
  "uu_setsid",
  "uucore",
@@ -1085,6 +1086,15 @@ dependencies = [
  "uucore",
 ]
 
+[[package]]
+name = "uu_renice"
+version = "0.0.1"
+dependencies = [
+ "clap",
+ "libc",
+ "uucore",
+]
+
 [[package]]
 name = "uu_rev"
 version = "0.0.1"

Cargo.toml

@@ -36,6 +36,7 @@ feat_common_core = [
   "lsmem",
   "mesg",
   "mountpoint",
+  "renice",
   "rev",
   "setsid",
 ]
@@ -82,6 +83,7 @@ lslocks = { optional = true, version = "0.0.1", package = "uu_lslocks", path = "
 lsmem = { optional = true, version = "0.0.1", package = "uu_lsmem", path = "src/uu/lsmem" }
 mesg = { optional = true, version = "0.0.1", package = "uu_mesg", path = "src/uu/mesg" }
 mountpoint = { optional = true, version = "0.0.1", package = "uu_mountpoint", path = "src/uu/mountpoint" }
+renice = { optional = true, version = "0.0.1", package = "uu_renice", path = "src/uu/renice" }
 rev = { optional = true, version = "0.0.1", package = "uu_rev", path = "src/uu/rev" }
 setsid = { optional = true, version = "0.0.1", package = "uu_setsid", path ="src/uu/setsid" }
 

src/uu/renice/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "uu_renice"
+version = "0.0.1"
+edition = "2021"
+description = "renice ~ (uutils) Alter priority of running processes"
+
+[lib]
+path = "src/renice.rs"
+
+[[bin]]
+name = "renice"
+path = "src/main.rs"
+
+[dependencies]
+clap = { workspace = true }
+libc = { workspace = true }
+uucore = { workspace = true }

src/uu/renice/renice.md

@@ -0,0 +1,7 @@
+# renice
+
+```
+renice [--priority|--relative] priority [-g|-p|-u] identifier...
+```
+
+Alter priority of running processes

src/uu/renice/src/main.rs

@@ -0,0 +1 @@
+uucore::bin!(uu_renice);

src/uu/renice/src/renice.rs

@@ -0,0 +1,65 @@
+// This file is part of the uutils util-linux package.
+//
+// For the full copyright and license information, please view the LICENSE
+// file that was distributed with this source code.
+
+use clap::{crate_version, Arg, Command};
+#[cfg(not(windows))]
+use libc::PRIO_PROCESS;
+use std::env;
+#[cfg(not(windows))]
+use std::io::Error;
+use std::process;
+use uucore::{error::UResult, format_usage, help_about, help_usage};
+
+const ABOUT: &str = help_about!("renice.md");
+const USAGE: &str = help_usage!("renice.md");
+
+#[uucore::main]
+pub fn uumain(args: impl uucore::Args) -> UResult<()> {
+    let matches = uu_app().try_get_matches_from(args)?;
+
+    let nice_value_str = matches.get_one::<String>("nice_value").unwrap(); // Retrieve as String
+    let nice_value = nice_value_str.parse::<i32>().unwrap_or_else(|_| {
+        eprintln!("Invalid nice value");
+        process::exit(1);
+    });
+
+    let pid_str = matches.get_one::<String>("pid").unwrap(); // Retrieve as String
+    let pid = pid_str.parse::<i32>().unwrap_or_else(|_| {
+        eprintln!("Invalid PID");
+        process::exit(1);
+    });
+
+    // TODO: implement functionality on windows
+    #[cfg(not(windows))]
+    if unsafe { libc::setpriority(PRIO_PROCESS, pid.try_into().unwrap(), nice_value) } == -1 {
+        eprintln!("Failed to set nice value: {}", Error::last_os_error());
+        process::exit(1);
+    }
+
+    println!("Nice value of process {} set to {}", pid, nice_value);
+    Ok(())
+}
+
+pub fn uu_app() -> Command {
+    Command::new(uucore::util_name())
+        .version(crate_version!())
+        .about(ABOUT)
+        .override_usage(format_usage(USAGE))
+        .infer_long_args(true)
+        .arg(
+            Arg::new("nice_value")
+                .value_name("NICE_VALUE")
+                .help("The new nice value for the process")
+                .required(true)
+                .index(1),
+        )
+        .arg(
+            Arg::new("pid")
+                .value_name("PID")
+                .help("The PID of the process")
+                .required(true)
+                .index(2),
+        )
+}

tests/by-util/test_renice.rs

@@ -0,0 +1,12 @@
+// This file is part of the uutils util-linux package.
+//
+// For the full copyright and license information, please view the LICENSE
+// file that was distributed with this source code.
+// spell-checker:ignore (words) symdir somefakedir
+
+use crate::common::util::TestScenario;
+
+#[test]
+fn test_invalid_arg() {
+    new_ucmd!().arg("--definitely-invalid").fails().code_is(1);
+}

tests/tests.rs

@@ -33,6 +33,10 @@ mod test_blockdev;
 #[path = "by-util/test_ctrlaltdel.rs"]
 mod test_ctrlaltdel;
 
+#[cfg(feature = "renice")]
+#[path = "by-util/test_renice.rs"]
+mod test_renice;
+
 #[cfg(feature = "rev")]
 #[path = "by-util/test_rev.rs"]
 mod test_rev;